阅读说明：本技术 自行车五通处微型变速器的换挡系统 (Gear shifting system of bicycle five-way miniature speed changer ) 是由 石幸运 石宗泽 于 2021-10-12 设计创作，主要内容包括：本发明的自行车五通处微型变速器的换挡系统涉及到自行车五通处的微型变速器。该换挡系统在变速器上盖的顶部从下向上设有四阶台阶,依次为一阶台阶、二阶台阶、三阶台阶、四阶台阶,在二阶台阶的左右两侧及后侧设有拉簧导向槽,在一阶台阶内设有换挡拨叉孔,在一阶台阶内装有换挡拨杆和换挡拨叉的触头；二阶台阶装有换挡滑块框；在三阶台阶装有前压板和后压板；在四阶台阶装有盖板；拉簧的两端连接在拉簧挂耳上,拉簧的中间点用螺钉固定。该换挡系统,创新了换挡滑块框的结构；优化了换挡拨杆的结构,大大减化了减档的传动机构,显著增加了稳定性、可靠性及耐久性,其制作、安装容易,使用方便、安全,具有推广价值。(The invention discloses a shifting system of a bicycle five-way miniature speed changer and relates to the bicycle five-way miniature speed changer. The gear shifting system is characterized in that four steps are arranged on the top of an upper cover of a transmission from bottom to top, namely a first step, a second step, a third step and a fourth step in sequence, tension spring guide grooves are formed in the left side, the right side and the rear side of the second step, a gear shifting fork hole is formed in the first step, and a gear shifting rod and a contact of the gear shifting fork are arranged in the first step; the second step is provided with a gear shifting slide block frame; a front pressure plate and a rear pressure plate are arranged on the three-step; a cover plate is arranged on the fourth step; two ends of the tension spring are connected to the tension spring hanging lug, and the middle point of the tension spring is fixed by a screw. The gear shifting system has the advantages that the structure of the gear shifting sliding block frame is innovated; the structure of the gear shifting deflector rod is optimized, the transmission mechanism for gear shifting is greatly simplified, the stability, the reliability and the durability are obviously improved, and the gear shifting deflector rod is easy to manufacture and install, convenient and safe to use and has popularization value.)

1. The utility model provides a shift system of miniature derailleur in bicycle five-way department which characterized in that: four steps are arranged on the top of the transmission upper cover (1) from bottom to top, namely a first step, a second step, a third step and a fourth step in sequence, tension spring guide grooves are formed in the left side, the right side and the rear side of the second step, a gear shifting fork hole (8) is formed in the first step, a gear shifting deflector rod (6) and a contact of a gear shifting fork (7) are arranged in the first step, and the contact of the gear shifting fork (7) extends out of the gear shifting fork hole (8) from bottom to top; the second-order step is provided with a gear shifting slide block frame (5), and the front section of the second-order step is provided with a tension spring suspension loop sliding chute (1 e); a tension spring (10) is arranged in the tension spring guide groove; a front pressing plate (3) and a rear pressing plate (9) are arranged on the three steps; a cover plate (4) is arranged on the fourth step; the gear shifting slider is composed of a gear shifting slider frame (5) and a gear shifting deflector rod (6), one end of the gear shifting deflector rod (6) is fixed on the gear shifting slider frame (5), a boss is arranged at the front end of the gear shifting slider frame (5), a gear shifting pull wire connecting hole (5 b) is arranged in the middle of the boss, tension spring lugs (5 a) are arranged on the left side and the right side of the front end of the gear shifting slider frame (5), two ends of a tension spring (10) are connected onto the tension spring lugs (5 a), a middle point of the tension spring (10) is fixed in the middle of a tension spring guide groove on the rear side through a screw (12), a gear shifting pull wire (2) is connected onto the gear shifting pull wire connecting hole (5 b), and an upper box body connecting hole (11) and a lower box body connecting hole are arranged on the transmission upper cover (1); the front pressing plate (3) and the rear pressing plate (9) are fixed on the three-step of the transmission upper cover (1) through screws, and the cover plate (4) is fixed on the four-step of the transmission upper cover (1) through screws.

2. The shifting system for a five-way miniature bicycle transmission of claim 1, wherein: the gearbox is characterized in that two upper corners of the left outer side of the gearbox upper cover (1) are provided with gearbox axial positioning sinking tables (1 a), the gearbox axial positioning sinking tables (1 a) are provided with threaded holes, a left bearing end cover (1 c) is arranged at a left bearing hole of the gearbox upper cover (1), a right bearing end cover (1 d) is arranged at a right bearing hole of the gearbox upper cover (1), and a shifting stay wire mounting groove (1 b) is arranged on the upper portion of the front end of the gearbox upper cover (1).

3. The shifting system of a bicycle five-way miniature transmission according to claim 1 or 2, wherein: four shifting fork holes (8) are arranged in the first-order step; the number of the gear shifting deflector rods (6) is four; the gear shifting driving rod (6) is arranged below the gear shifting slider frame (5), a first gear driving rod (6 a), a second gear driving rod (6 b), a third gear driving rod (6 c) and a fourth gear driving rod (6 d) are sequentially arranged from right to left, the gear shifting pull wire (2) drives the gear shifting slider frame (5) and the gear shifting driving rod (6) to move forwards for gear shifting, when the gear shifting slider frame (5) is positioned on the rear side, the first gear is meshed, the gear shifting slider frame (5) moves a gear distance forwards from back to front, the second gear is meshed, the second gear is moved a gear distance forwards, the third gear is meshed, a gear distance is moved forwards again, the gear shifting slider frame (5) reaches a front end point, and the fourth gear is meshed; the gear shifting pull wire (2) is loosened, the tension spring (10) drives the gear shifting slider frame (5) and the gear shifting driving rod (6) to move backwards to perform gear reduction, the gear shifting slider frame (5) moves backwards by one gear distance from the front, the third gear is meshed, then moves backwards by one gear distance, the second gear is meshed, then moves backwards by one gear distance, the gear shifting slider frame (5) reaches the rear end terminal point, and the first gear is meshed; the outer end of the tension spring hanging lug (5 a) is bent downwards, and the tension spring hanging lug (5 a) slides in the tension spring hanging lug sliding groove (1 e).

4. The shifting system for a five-way miniature bicycle transmission of claim 3, wherein: the rear ends of the first-gear shifting rod (6 a) and the second-gear shifting rod (6 b) are connected into a whole, the rear ends of the first-gear shifting rod and the second-gear shifting rod are fixed below a front transverse frame of the gear shifting slider frame (5), and the front ends of the first-gear shifting rod (6 a) and the second-gear shifting rod (6 b) are located below a rear transverse frame of the gear shifting slider frame (5); the rear ends of the third-gear shifting rod (6 c) and the fourth-gear shifting rod (6 d) are connected into a whole, the rear ends of the third-gear shifting rod and the fourth-gear shifting rod are fixed below a rear transverse frame of the gear shifting slider frame (5), and the front ends of the third-gear shifting rod (6 c) and the fourth-gear shifting rod (6 d) are positioned below a front transverse frame of the gear shifting slider frame (5); the thickness of the gear shifting slide block frame is 0.5-2 mm, the thickness of the gear shifting slide block deflector rod (6) is 0.5-3 mm, the thickness of the front pressing plate (3) and the rear pressing plate (9) is 0.2-2 mm, and the thickness of the cover plate (4) is 0.2-2 mm; the gear shifting slide block frame (5), the gear shifting deflector rod (6), the front pressing plate (3) and the rear pressing plate (9) are made of stainless steel plates.

Technical Field

The invention relates to a miniature speed changer at a five-way joint of a bicycle, in particular to a gear shifting system of the miniature speed changer at the five-way joint of the bicycle.

Background

A bicycle, also called as a bicycle or a bicycle, mainly comprises a frame, a front wheel, a rear wheel, a front fork, a handlebar, a middle shaft, pedals, a chain plate, a chain, a brake and the like. The speed variator is arranged at the five-way position of the frame of the bicycle, namely a bicycle middle shaft speed variator, a bicycle five-way position micro speed variator, a bicycle five-way position internal speed variator and the like. In recent years, our team specializes in the research and development work of miniature speed variator at bicycle five-way joint, and applies for some patents: for example, the bicycle is named as bicycle with a miniature box type speed changer on a center shaft, the patent number is ZL201010518569.9, and the application date is 10 months and 25 days in 2010; the bicycle transmission is named as a bicycle miniature box type transmission, the patent number is ZL 201010518578.8, and the patent application date is 10 months and 25 days in 2010; the bicycle is named as a shifting device of a bicycle miniature gearbox, the patent number is ZL 201010518576.9, and the application date is 10 months and 25 days in 2010; the bicycle micro gearbox sliding block type gear shifting device is named as a sliding block type gear shifting device of a bicycle micro gearbox, the patent application number is 2014101500245, the patent application date is 4 and 15 days 2014, the bicycle micro gearbox sliding block type gear shifting device is named as a single wire pulling sliding block type gear shifting device of a bicycle micro gearbox, the patent right number is ZL 2016205463269, and the patent application date is 2016, 6 and 7 days. Although the bicycle bottom bracket bearing speed changer has been developed successfully basically, the single-pull wire slide block type gear shifting device of the bicycle miniature gearbox with patent right number ZL 2016205463269 can realize the functions from the working principle and the structure, but after the product is put on the market, some big problems are found, after a period of time, the gear shifting is easy to break down, the gear shifting can not be performed, and the main reasons are that: firstly, the gear shifting sliding block adopts a structure that two gear shifting pull ropes, two tension springs and four corner pulleys realize gear shifting, the reliability is extremely poor, and a gear shifting mechanism cannot normally work in severe jolting of a bicycle; and secondly, the contact ends of the first gear shifting rod, the third gear shifting rod and the fourth gear shifting rod are in a cantilever state, when the shifting rods are stressed, the contacts of the shifting rods are easy to warp, the contacts of the shifting rods are seriously influenced to drive the contacts of the shifting forks, and the normal operation of gear-up and gear-down is often caused. In order to overcome the defects of the single-stay-wire slider type gear shifting device of the existing bicycle miniature gearbox and promote the application of the bicycle miniature gearbox to a bicycle, a new gear shifting system of the bicycle five-way miniature gearbox is to be explored.

Disclosure of Invention

The purpose of the invention is as follows: a shifting system for a five-way miniature transmission of a bicycle is provided.

The technical scheme of the invention is that the gear shifting system of the bicycle five-way miniature transmission is characterized in that: the top of the transmission upper cover is provided with four steps from bottom to top, namely a first step, a second step, a third step and a fourth step in sequence, tension spring guide grooves are formed in the left side, the right side and the rear side of the second step, a gear shifting fork hole is formed in the first step, a gear shifting deflector rod and a contact of the gear shifting fork are arranged in the first step, and the contact of the gear shifting fork extends out of the gear shifting fork hole from bottom to top; the second-order step is provided with a gear shifting slide block frame, and the front section of the second-order step is provided with a tension spring hanger chute; a tension spring is arranged in the tension spring guide groove; a front pressure plate and a rear pressure plate are arranged on the three-step; a cover plate is arranged on the fourth step; the gear shifting slider consists of a gear shifting slider frame and a gear shifting driving lever, one end of the gear shifting driving lever is fixed on the gear shifting slider frame, a boss is arranged at the front end of the gear shifting slider frame, a gear shifting pull wire connecting hole is arranged in the middle of the boss, tension spring hangers are arranged on the left side and the right side of the front end of the gear shifting slider frame, two ends of each tension spring are connected to the tension spring hangers, the middle point of each tension spring is fixed in the middle of a tension spring guide groove on the rear side through screws, a gear shifting pull wire is connected to the gear shifting pull wire connecting hole, and an upper box body connecting hole and a lower box body connecting hole are arranged on an upper cover of the transmission; the front pressing plate and the rear pressing plate are fixed on the three-step steps of the transmission upper cover through screws, and the cover plate is fixed on the four-step steps of the transmission upper cover through screws.

The shifting system of the miniature bicycle five-way speed changer is characterized in that two upper corners of the left outer side of the upper cover of the speed changer are provided with speed changer axial positioning sinking platforms, the speed changer axial positioning sinking platforms are provided with threaded holes, a left bearing end cover is arranged at a left bearing hole of the upper cover of the speed changer, a right bearing end cover is arranged at a right bearing hole of the upper cover of the speed changer, and a shifting stay wire mounting groove is arranged on the upper portion of the front end of the upper cover of the speed changer.

In the gear shifting system of the bicycle five-way miniature transmission, four gear shifting fork holes are formed in the first-order step; the number of the gear shifting deflector rods is four; the gear shifting driving rod is arranged below the gear shifting slider frame and sequentially comprises a first-gear driving rod, a second-gear driving rod, a third-gear driving rod and a fourth-gear driving rod from right to left, a gear shifting pull wire drives the gear shifting slider frame and the gear shifting driving rod to move forwards for gear shifting, when the gear shifting slider frame is positioned on the rear side, the first gear is meshed, the gear shifting slider frame moves forwards from the rear direction by a gear distance, the second gear is meshed, then the first gear is meshed, the third gear is meshed, then the first gear is moved forwards by a gear distance, the gear shifting slider frame reaches a front end point, and the fourth gear is meshed; the gear shifting pull wire is loosened, the tension spring drives the gear shifting slider frame and the gear shifting driving rod to move backwards to perform gear reduction, the gear shifting slider frame moves a gear distance from front to back, the third gear is meshed, then moves a gear distance backwards, the second gear is meshed, then moves a gear distance backwards, and the first gear is meshed after the gear shifting slider frame reaches the rear end endpoint; the outer end of the tension spring hanging lug bends downwards, and the tension spring hanging lug slides in the tension spring hanging lug sliding groove.

In the gear shifting system of the miniature bicycle transmission at the five-way position, the rear ends of a first shift lever and a second shift lever are connected into a whole, the rear ends of the first shift lever and the second shift lever are fixed below the front transverse frame of the gear shifting slider frame, and the front ends of the first shift lever and the second shift lever are positioned below the rear transverse frame of the gear shifting slider frame; the rear ends of the third-gear shifting rod and the fourth-gear shifting rod are connected into a whole, the rear ends of the third-gear shifting rod and the fourth-gear shifting rod are fixed below a rear transverse frame of the gear shifting slider frame, and the front ends of the third-gear shifting rod and the fourth-gear shifting rod are positioned below a front transverse frame of the gear shifting slider frame; the thickness of the gear shifting slide block frame is 0.5-2 mm, the thickness of the gear shifting slide block deflector rod is 0.5-3 mm, the thickness of the front pressing plate and the rear pressing plate is 0.2-2 mm, and the thickness of the cover plate is 0.2-2 mm; the gear shifting slide block frame, the gear shifting driving rod, the front pressing plate and the rear pressing plate are made of stainless steel plates.

In the invention, a transmission mechanism for reducing gears is innovated; the structure of the gear shifting sliding block frame is innovated; the structure of the gear shifting deflector rods is optimized, so that the contact of each gear shifting deflector rod is arranged below the transverse frame of the gear shifting slider frame, and the contact of the gear shifting deflector rods does not swing up and down; the structure of the transmission upper cover is optimized.

According to the working principle of the invention, the shifting slide block moves back and forth, and the engagement or disconnection between the contact of the shifting deflector rod and the contact of the shifting fork is changed; when the contact of the gear shifting deflector rod is meshed with the contact of the gear shifting fork, the gear shifting fork pushes an end face ratchet wheel of an end face clutch gear in the transmission to be meshed with a sleeve end face pawl of an end face clutch pawl sleeve; when the contact of the gear shifting deflector rod is disconnected with the contact of the gear shifting fork, under the action of the elastic force of a spring in the transmission and under the separation of overrunning clutch of the end face ratchet wheel and the sleeve end face pawl, the end face ratchet wheel of the end face clutch gear of the original meshing pair is separated from the sleeve end face pawl of the end face clutch pawl sleeve; in the transmission, the gear is shifted first and then shifted, namely, when the gear is shifted, an end face ratchet wheel of a new pair of end face clutch gears is firstly meshed with a sleeve end face pawl of an end face clutch pawl sleeve, and then the end face ratchet wheel of the end face clutch gear which is originally meshed is disconnected with the sleeve end face pawl of the end face clutch pawl sleeve.

When adding the fender, press the handle that adds the fender once, the finger ware of shifting of bicycle drives to shift and acts as go-between and move a gear step forward, and the slider frame of shifting and the driving lever of shifting just move a gear step forward, just realize earlier that the one-level keeps off the new meshing of position, and the former meshing keeps off the position disconnection immediately, and it adds the fender law and is: first gear → second gear → third gear → fourth gear; when stepping down, press the handle that steps down once, the extension spring drives the slider of shifting gears and shifts the driving lever and move a gear distance backward, just realizes earlier that next-level keeps off the new meshing of position, and former meshing keeps off the position disconnection immediately, and its law of stepping down is: fourth gear → third gear → second gear → first gear. The gear distance is the distance that the shift slide moves between two adjacent gears. The bicycle shift finger is disposed on a handlebar of the bicycle, generally on the left side of the handlebar.

The end surface ratchet wheel and the sleeve end surface pawl of the ratchet wheel type overrunning clutch are special ratchet wheel type overrunning clutches, and the end surface ratchet wheel and the sleeve end surface pawl of the ratchet wheel type overrunning clutch can be engaged and disengaged manually. The gear shifting system is essentially a system for manually controlling a plurality of special ratchet type overrunning clutches to work.

The invention has the beneficial effects that: compared with the single-stay-wire slide block type gear shifting device of the original bicycle miniature gearbox, the gear shifting system of the bicycle five-way miniature gearbox has the advantages that a gear-reducing transmission mechanism is created, two gear-reducing stay wires, four pulleys and one gear-reducing spring are reduced, and the structure of a gear-shifting slide block frame is created; the structure of the gear shifting deflector rod is optimized, the gear-shifting transmission mechanism is greatly simplified, the stability, reliability and durability of the gear-shifting transmission mechanism are obviously improved, the using effect and reliability of the bicycle miniature speed changer are obviously improved, the application of the bicycle miniature speed changer in a bicycle is ensured, and the gear shifting deflector rod is easy to manufacture and install, convenient and safe to use and has popularization value.

Drawings

FIG. 1 is a schematic top view of the present invention;

FIG. 2 is a sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

FIG. 4 is a schematic view of the cover plate of FIG. 1 with the cover plate removed;

FIG. 5 is a schematic view of the cover plate, front platen, and rear platen shown in FIG. 1 with the cover plate, front platen, and rear platen removed;

FIG. 6 is a schematic top view of the shift block;

FIG. 7 is a schematic bottom view of the shift block;

reference numerals: the gearbox comprises a gearbox upper cover 1, a gearbox axial positioning sinking platform 1a, a gear shifting stay wire mounting groove 1b, a left bearing end cover 1c, a right bearing end cover 1d, a tension spring hanger sliding groove 1e, a gear shifting stay wire 2, a front pressing plate 3, a cover plate 4, a gear shifting slider frame 5, a tension spring hanger 5a, a gear shifting stay wire connecting hole 5b, a gear shifting deflector rod 6, a first-gear deflector rod 6a, a second-gear deflector rod 6b, a third-gear deflector rod 6c, a fourth-gear deflector rod 6d, a gear shifting fork 7, a gear shifting fork hole 8, a rear pressing plate 9, a tension spring 10, an upper box body connecting hole 11, a lower box body connecting hole 11 and a screw 12.

Detailed Description

The present invention is further illustrated by the following examples.

Example 1

Referring to fig. 1, 2, 3, 4, 5, 6 and 7, a gear shifting system of a bicycle five-way miniature transmission is characterized in that a four-step, a first-step, a second-step, a third-step and a fourth-step are sequentially arranged on the top of a transmission upper cover 1 from bottom to top, tension spring guide grooves are arranged on the left side, the right side and the rear side of the second-step, a gear shifting fork hole 8 is formed in the first-step, a gear shifting rod 6 and a contact of the gear shifting fork 7 are arranged in the first-step, and the contact of the gear shifting fork 7 extends out of the gear shifting fork hole 8 from bottom to top; the second-order step is provided with a gear shifting slide block frame 5, and the front section of the second-order step is provided with a tension spring hanging lug sliding chute 1 e; a tension spring 10 is arranged in the tension spring guide groove; a front pressing plate 3 and a rear pressing plate 9 are arranged on the three steps; a cover plate 4 is arranged on the fourth step; the gear shifting slider consists of a gear shifting slider frame 5 and a gear shifting deflector rod 6, one end of the gear shifting deflector rod 6 is fixed on the gear shifting slider frame 5, a boss is arranged at the front end of the gear shifting slider frame 5, a gear shifting pull wire connecting hole 5b is arranged in the middle of the boss, tension spring hangers 5a are arranged on the left side and the right side of the front end of the gear shifting slider frame 5, two ends of a tension spring 10 are connected to the tension spring hangers 5a, the middle point of the tension spring 10 is fixed in the middle of a tension spring guide groove on the rear side by a screw 12, a gear shifting pull wire 2 is connected to the gear shifting pull wire connecting hole 5b, and an upper box body connecting hole 11 and a lower box body connecting hole 11 are arranged on the transmission upper cover 1; the front pressure plate 3 and the rear pressure plate 9 are fixed on the three steps of the transmission upper cover 1 by screws, and the cover plate 4 is fixed on the four steps of the transmission upper cover 1 by screws.

Example 2

Referring to fig. 1, 2, 3, 4, 5, 6 and 7, a gear shifting system of a bicycle five-way miniature transmission is characterized in that a four-step, a first-step, a second-step, a third-step and a fourth-step are sequentially arranged on the top of a transmission upper cover 1 from bottom to top, tension spring guide grooves are arranged on the left side, the right side and the rear side of the second-step, a gear shifting fork hole 8 is formed in the first-step, a gear shifting rod 6 and a contact of the gear shifting fork 7 are arranged in the first-step, and the contact of the gear shifting fork 7 extends out of the gear shifting fork hole 8 from bottom to top; the second-order step is provided with a gear shifting slide block frame 5, and the front section of the second-order step is provided with a tension spring hanging lug sliding chute 1 e; a tension spring 10 is arranged in the tension spring guide groove; a front pressing plate 3 and a rear pressing plate 9 are arranged on the three steps; a cover plate 4 is arranged on the fourth step; the gear shifting slider consists of a gear shifting slider frame 5 and a gear shifting deflector rod 6, one end of the gear shifting deflector rod 6 is fixed on the gear shifting slider frame 5, a boss is arranged at the front end of the gear shifting slider frame 5, a gear shifting pull wire connecting hole 5b is arranged in the middle of the boss, tension spring hangers 5a are arranged on the left side and the right side of the front end of the gear shifting slider frame 5, two ends of a tension spring 10 are connected to the tension spring hangers 5a, the middle point of the tension spring 10 is fixed in the middle of a tension spring guide groove on the rear side by a screw 12, a gear shifting pull wire 2 is connected to the gear shifting pull wire connecting hole 5b, and an upper box body connecting hole 11 and a lower box body connecting hole 11 are arranged on the transmission upper cover 1; the front pressure plate 3 and the rear pressure plate 9 are fixed on the three steps of the transmission upper cover 1 by screws, and the cover plate 4 is fixed on the four steps of the transmission upper cover 1 by screws. The transmission axial positioning sinking platform is characterized in that two upper corners of the left outer side of the transmission upper cover 1 are provided with transmission axial positioning sinking platforms 1a, a threaded hole is formed in each transmission axial positioning sinking platform 1a, a left bearing end cover 1c is arranged at a left side bearing hole of the transmission upper cover 1, a right bearing end cover 1d is arranged at a right side bearing hole of the transmission upper cover 1, and a shifting stay wire mounting groove 1b is formed in the upper portion of the front end of the transmission upper cover 1.

Example 3

Referring to fig. 1, 2, 3, 4, 5, 6 and 7, a gear shifting system of a bicycle five-way miniature transmission is characterized in that a four-step, a first-step, a second-step, a third-step and a fourth-step are sequentially arranged on the top of a transmission upper cover 1 from bottom to top, tension spring guide grooves are arranged on the left side, the right side and the rear side of the second-step, a gear shifting fork hole 8 is formed in the first-step, a gear shifting rod 6 and a contact of the gear shifting fork 7 are arranged in the first-step, and the contact of the gear shifting fork 7 extends out of the gear shifting fork hole 8 from bottom to top; the second-order step is provided with a gear shifting slide block frame 5, and the front section of the second-order step is provided with a tension spring hanging lug sliding chute 1 e; a tension spring 10 is arranged in the tension spring guide groove; a front pressing plate 3 and a rear pressing plate 9 are arranged on the three steps; a cover plate 4 is arranged on the fourth step; the gear shifting slider consists of a gear shifting slider frame 5 and a gear shifting deflector rod 6, one end of the gear shifting deflector rod 6 is fixed on the gear shifting slider frame 5, a boss is arranged at the front end of the gear shifting slider frame 5, a gear shifting pull wire connecting hole 5b is arranged in the middle of the boss, tension spring hangers 5a are arranged on the left side and the right side of the front end of the gear shifting slider frame 5, two ends of a tension spring 10 are connected to the tension spring hangers 5a, the middle point of the tension spring 10 is fixed in the middle of a tension spring guide groove on the rear side by a screw 12, a gear shifting pull wire 2 is connected to the gear shifting pull wire connecting hole 5b, and an upper box body connecting hole 11 and a lower box body connecting hole 11 are arranged on the transmission upper cover 1; the front pressure plate 3 and the rear pressure plate 9 are fixed on the three steps of the transmission upper cover 1 by screws, and the cover plate 4 is fixed on the four steps of the transmission upper cover 1 by screws. Four shifting fork holes 8 are formed in the first-order step; the number of the gear shifting deflector rods 6 is four; the gear shifting deflector rod 6 arranged below the gear shifting slider frame 5 is sequentially provided with a first-gear deflector rod 6a, a second-gear deflector rod 6b, a third-gear deflector rod 6c and a fourth-gear deflector rod 6d from right to left, the gear shifting stay wire 2 drives the gear shifting slider frame 5 and the gear shifting deflector rod 6 to move forwards for gear shifting, when the gear shifting slider frame 5 is positioned at the rear side, the first gear is meshed, the gear shifting slider frame 5 moves forwards by one gear distance from the rear direction, the second gear is meshed, the third gear is meshed, the gear distance is moved forwards again, the gear shifting slider frame 5 reaches a front end point, and the fourth gear is meshed; the gear shifting pull wire 2 is loosened, the tension spring 10 drives the gear shifting slider frame 5 and the gear shifting deflector rod 6 to move backwards to perform gear reduction, the gear shifting slider frame 5 moves backwards by a gear distance from front to back, the third gear is meshed, then moves backwards by a gear distance, the second gear is meshed, then moves backwards by a gear distance, and the first gear is meshed after the gear shifting slider frame 5 reaches the rear end endpoint; the outer end of the tension spring hanging lug 5a is bent downwards, and the tension spring hanging lug 5a slides in the tension spring hanging lug sliding groove 1 e.

Example 4

Referring to fig. 1, 2, 3, 4, 5, 6 and 7, a gear shifting system of a bicycle five-way miniature transmission is characterized in that a four-step, a first-step, a second-step, a third-step and a fourth-step are sequentially arranged on the top of a transmission upper cover 1 from bottom to top, tension spring guide grooves are arranged on the left side, the right side and the rear side of the second-step, a gear shifting fork hole 8 is formed in the first-step, a gear shifting rod 6 and a contact of the gear shifting fork 7 are arranged in the first-step, and the contact of the gear shifting fork 7 extends out of the gear shifting fork hole 8 from bottom to top; the second-order step is provided with a gear shifting slide block frame 5, and the front section of the second-order step is provided with a tension spring hanging lug sliding chute 1 e; a tension spring 10 is arranged in the tension spring guide groove; a front pressing plate 3 and a rear pressing plate 9 are arranged on the three steps; a cover plate 4 is arranged on the fourth step; the gear shifting slider consists of a gear shifting slider frame 5 and a gear shifting deflector rod 6, one end of the gear shifting deflector rod 6 is fixed on the gear shifting slider frame 5, a boss is arranged at the front end of the gear shifting slider frame 5, a gear shifting pull wire connecting hole 5b is arranged in the middle of the boss, tension spring hangers 5a are arranged on the left side and the right side of the front end of the gear shifting slider frame 5, two ends of a tension spring 10 are connected to the tension spring hangers 5a, the middle point of the tension spring 10 is fixed in the middle of a tension spring guide groove on the rear side by a screw 12, a gear shifting pull wire 2 is connected to the gear shifting pull wire connecting hole 5b, and an upper box body connecting hole 11 and a lower box body connecting hole 11 are arranged on the transmission upper cover 1; the front pressure plate 3 and the rear pressure plate 9 are fixed on the three steps of the transmission upper cover 1 by screws, and the cover plate 4 is fixed on the four steps of the transmission upper cover 1 by screws. The transmission axial positioning sinking platform is characterized in that two upper corners of the left outer side of the transmission upper cover 1 are provided with transmission axial positioning sinking platforms 1a, a threaded hole is formed in each transmission axial positioning sinking platform 1a, a left bearing end cover 1c is arranged at a left side bearing hole of the transmission upper cover 1, a right bearing end cover 1d is arranged at a right side bearing hole of the transmission upper cover 1, and a shifting stay wire mounting groove 1b is formed in the upper portion of the front end of the transmission upper cover 1. Four shifting fork holes 8 are formed in the first-order step; the number of the gear shifting deflector rods 6 is four; the gear shifting deflector rod 6 arranged below the gear shifting slider frame 5 is sequentially provided with a first-gear deflector rod 6a, a second-gear deflector rod 6b, a third-gear deflector rod 6c and a fourth-gear deflector rod 6d from right to left, the gear shifting stay wire 2 drives the gear shifting slider frame 5 and the gear shifting deflector rod 6 to move forwards for gear shifting, when the gear shifting slider frame 5 is positioned at the rear side, the first gear is meshed, the gear shifting slider frame 5 moves forwards by one gear distance from the rear direction, the second gear is meshed, the third gear is meshed, the gear distance is moved forwards again, the gear shifting slider frame 5 reaches a front end point, and the fourth gear is meshed; the gear shifting pull wire 2 is loosened, the tension spring 10 drives the gear shifting slider frame 5 and the gear shifting deflector rod 6 to move backwards to perform gear reduction, the gear shifting slider frame 5 moves backwards by a gear distance from front to back, the third gear is meshed, then moves backwards by a gear distance, the second gear is meshed, then moves backwards by a gear distance, and the first gear is meshed after the gear shifting slider frame 5 reaches the rear end endpoint; the outer end of the tension spring hanging lug 5a is bent downwards, and the tension spring hanging lug 5a slides in the tension spring hanging lug sliding groove 1 e.

Example 5

Referring to fig. 1, 2, 3, 4, 5, 6 and 7, a gear shifting system of a bicycle five-way miniature transmission is characterized in that a four-step, a first-step, a second-step, a third-step and a fourth-step are sequentially arranged on the top of a transmission upper cover 1 from bottom to top, tension spring guide grooves are arranged on the left side, the right side and the rear side of the second-step, a gear shifting fork hole 8 is formed in the first-step, a gear shifting rod 6 and a contact of the gear shifting fork 7 are arranged in the first-step, and the contact of the gear shifting fork 7 extends out of the gear shifting fork hole 8 from bottom to top; the second-order step is provided with a gear shifting slide block frame 5, and the front section of the second-order step is provided with a tension spring hanging lug sliding chute 1 e; a tension spring 10 is arranged in the tension spring guide groove; a front pressing plate 3 and a rear pressing plate 9 are arranged on the three steps; a cover plate 4 is arranged on the fourth step; the gear shifting slider consists of a gear shifting slider frame 5 and a gear shifting deflector rod 6, one end of the gear shifting deflector rod 6 is fixed on the gear shifting slider frame 5, a boss is arranged at the front end of the gear shifting slider frame 5, a gear shifting pull wire connecting hole 5b is arranged in the middle of the boss, tension spring hangers 5a are arranged on the left side and the right side of the front end of the gear shifting slider frame 5, two ends of a tension spring 10 are connected to the tension spring hangers 5a, the middle point of the tension spring 10 is fixed in the middle of a tension spring guide groove on the rear side by a screw 12, a gear shifting pull wire 2 is connected to the gear shifting pull wire connecting hole 5b, and an upper box body connecting hole 11 and a lower box body connecting hole 11 are arranged on the transmission upper cover 1; the front pressure plate 3 and the rear pressure plate 9 are fixed on the three steps of the transmission upper cover 1 by screws, and the cover plate 4 is fixed on the four steps of the transmission upper cover 1 by screws. The transmission axial positioning sinking platform is characterized in that two upper corners of the left outer side of the transmission upper cover 1 are provided with transmission axial positioning sinking platforms 1a, a threaded hole is formed in each transmission axial positioning sinking platform 1a, a left bearing end cover 1c is arranged at a left side bearing hole of the transmission upper cover 1, a right bearing end cover 1d is arranged at a right side bearing hole of the transmission upper cover 1, and a shifting stay wire mounting groove 1b is formed in the upper portion of the front end of the transmission upper cover 1. The rear ends of the first-gear shifting rod 6a and the second-gear shifting rod 6b are connected into a whole, the rear ends of the first-gear shifting rod 6a and the second-gear shifting rod 6b are fixed below a front transverse frame of the gear shifting slider frame 5, and the front ends of the first-gear shifting rod 6a and the second-gear shifting rod 6b are located below a rear transverse frame of the gear shifting slider frame 5; the rear ends of the third-gear shifting rod 6c and the fourth-gear shifting rod 6d are connected into a whole, the rear ends of the third-gear shifting rod 6c and the fourth-gear shifting rod 6d are fixed below a rear transverse frame of the gear shifting slider frame 5, and the front ends of the third-gear shifting rod 6c and the fourth-gear shifting rod 6d are located below a front transverse frame of the gear shifting slider frame 5; the thickness of the gear shifting slide block frame is 0.5-2 mm, the thickness of the gear shifting slide block deflector rod 6 is 0.5-3 mm, the thickness of the front pressing plate 3 and the rear pressing plate 9 is 0.2-2 mm, and the thickness of the cover plate 4 is 0.2-2 mm; the gear shifting slide block frame 5, the gear shifting deflector rod 6, the front pressing plate 3 and the rear pressing plate 9 are made of stainless steel plates.

Example 6

Referring to fig. 1, 2, 3, 4, 5, 6 and 7, a gear shifting system of a bicycle five-way miniature transmission is characterized in that a four-step, a first-step, a second-step, a third-step and a fourth-step are sequentially arranged on the top of a transmission upper cover 1 from bottom to top, tension spring guide grooves are arranged on the left side, the right side and the rear side of the second-step, a gear shifting fork hole 8 is formed in the first-step, a gear shifting rod 6 and a contact of the gear shifting fork 7 are arranged in the first-step, and the contact of the gear shifting fork 7 extends out of the gear shifting fork hole 8 from bottom to top; the second-order step is provided with a gear shifting slide block frame 5, and the front section of the second-order step is provided with a tension spring hanging lug sliding chute 1 e; a tension spring 10 is arranged in the tension spring guide groove; a front pressing plate 3 and a rear pressing plate 9 are arranged on the three steps; a cover plate 4 is arranged on the fourth step; the gear shifting slider consists of a gear shifting slider frame 5 and a gear shifting deflector rod 6, one end of the gear shifting deflector rod 6 is fixed on the gear shifting slider frame 5, a boss is arranged at the front end of the gear shifting slider frame 5, a gear shifting pull wire connecting hole 5b is arranged in the middle of the boss, tension spring hangers 5a are arranged on the left side and the right side of the front end of the gear shifting slider frame 5, two ends of a tension spring 10 are connected to the tension spring hangers 5a, the middle point of the tension spring 10 is fixed in the middle of a tension spring guide groove on the rear side by a screw 12, a gear shifting pull wire 2 is connected to the gear shifting pull wire connecting hole 5b, and an upper box body connecting hole 11 and a lower box body connecting hole 11 are arranged on the transmission upper cover 1; the front pressure plate 3 and the rear pressure plate 9 are fixed on the three steps of the transmission upper cover 1 by screws, and the cover plate 4 is fixed on the four steps of the transmission upper cover 1 by screws. The transmission axial positioning sinking platform is characterized in that two upper corners of the left outer side of the transmission upper cover 1 are provided with transmission axial positioning sinking platforms 1a, a threaded hole is formed in each transmission axial positioning sinking platform 1a, a left bearing end cover 1c is arranged at a left side bearing hole of the transmission upper cover 1, a right bearing end cover 1d is arranged at a right side bearing hole of the transmission upper cover 1, and a shifting stay wire mounting groove 1b is formed in the upper portion of the front end of the transmission upper cover 1. Four shifting fork holes 8 are formed in the first-order step; the number of the gear shifting deflector rods 6 is four; the gear shifting deflector rod 6 arranged below the gear shifting slider frame 5 is sequentially provided with a first-gear deflector rod 6a, a second-gear deflector rod 6b, a third-gear deflector rod 6c and a fourth-gear deflector rod 6d from right to left, the gear shifting stay wire 2 drives the gear shifting slider frame 5 and the gear shifting deflector rod 6 to move forwards for gear shifting, when the gear shifting slider frame 5 is positioned at the rear side, the first gear is meshed, the gear shifting slider frame 5 moves forwards by one gear distance from the rear direction, the second gear is meshed, the third gear is meshed, the gear distance is moved forwards again, the gear shifting slider frame 5 reaches a front end point, and the fourth gear is meshed; the gear shifting pull wire 2 is loosened, the tension spring 10 drives the gear shifting slider frame 5 and the gear shifting deflector rod 6 to move backwards to perform gear reduction, the gear shifting slider frame 5 moves backwards by a gear distance from front to back, the third gear is meshed, then moves backwards by a gear distance, the second gear is meshed, then moves backwards by a gear distance, and the first gear is meshed after the gear shifting slider frame 5 reaches the rear end endpoint; the outer end of the tension spring hanging lug 5a is bent downwards, and the tension spring hanging lug 5a slides in the tension spring hanging lug sliding groove 1 e. The rear ends of the first-gear shifting rod 6a and the second-gear shifting rod 6b are connected into a whole, the rear ends of the first-gear shifting rod 6a and the second-gear shifting rod 6b are fixed below a front transverse frame of the gear shifting slider frame 5, and the front ends of the first-gear shifting rod 6a and the second-gear shifting rod 6b are located below a rear transverse frame of the gear shifting slider frame 5; the rear ends of the third-gear shifting rod 6c and the fourth-gear shifting rod 6d are connected into a whole, the rear ends of the third-gear shifting rod 6c and the fourth-gear shifting rod 6d are fixed below a rear transverse frame of the gear shifting slider frame 5, and the front ends of the third-gear shifting rod 6c and the fourth-gear shifting rod 6d are located below a front transverse frame of the gear shifting slider frame 5; the thickness of the gear shifting slide block frame is 0.5-2 mm, the thickness of the gear shifting slide block deflector rod 6 is 0.5-3 mm, the thickness of the front pressing plate 3 and the rear pressing plate 9 is 0.2-2 mm, and the thickness of the cover plate 4 is 0.2-2 mm; the gear shifting slide block frame 5, the gear shifting deflector rod 6, the front pressing plate 3 and the rear pressing plate 9 are made of stainless steel plates.